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1. This compound is a tetramethyl ether of methane.
这个化合物是甲烷的四甲基醚。
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2. The tetramethylene group is a common structural motif in many organic compounds.
四甲基烯基是许多有机化合物中常见的结构单元。
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3. Tetramethylene is a type of carbon-carbon double bond with four carbon atoms.
四甲基烯是一种具有四个碳原子的碳碳双键。